Impairment (Schedule Of Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Asset Impairment [Line Items]
Other	$ 95	$ 0
Total impairment charges	14,986	43
Equity in earnings of real estate joint ventures and partnerships, net	5,317	4,093
Net impact of impairment charges	15,022	369
Properties Held for Sale, Marketed for Sale or Sold [Member]
Asset Impairment [Line Items]
Impairment losses related to property	12,172	43
Land Held For Development And Undeveloped Land [Member]
Asset Impairment [Line Items]
Impairment losses related to property	2,719	0
Impairment in Equity in Earnings (Losses) of Real Estate Joint Venture And Partnership Net [Member]
Asset Impairment [Line Items]
Equity in earnings of real estate joint ventures and partnerships, net	0	326
Impairment in Net Income Attributable to Noncontrolling Interest [Member]
Asset Impairment [Line Items]
Net income attributable to noncontrolling interests	$ 36	$ 0

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Amount of Income (Loss) attributable to the noncontrolling interest.

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Net Impact Of Impairment Charges on Income Statement

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